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Kyanite-eclogite
A rock subtype
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About Kyanite-eclogite
Kyanite-eclogite is an eclogite that contains kyanite as a notable, though not dominant, mineral component. There are no strict upper or lower limits on the amount of kyanite required to classify a rock as kyanite-eclogite. Instead, the term is used to highlight specific petrological or geological features that distinguish these rocks from other types of eclogite.
Kyanite-eclogites occur in several geological settings:
Group A eclogites, which are associated with kimberlite (Mikhailenko et al., 2019),
Group B eclogites, formed during orogenic (mountain-building) prograde metamorphism (Terry et al., 2000),
Group C eclogites, which form in subduction zones (Ãetinkaplan et al., 2016).
These rocks form and remain stable across a wide range of pressure-temperature (P-T) conditions within the eclogite facies domain, including ultrahigh-pressure (UHP) conditions where coesite may be present (Terry et al., 2000). Kyanite-eclogites typically originate from aluminum-rich basic rocks, such as Al-rich basalts, gabbros, or pyroxene granulites (Green, 1967).
Kyanite-eclogites occur in several geological settings:
Group A eclogites, which are associated with kimberlite (Mikhailenko et al., 2019),
Group B eclogites, formed during orogenic (mountain-building) prograde metamorphism (Terry et al., 2000),
Group C eclogites, which form in subduction zones (Ãetinkaplan et al., 2016).
These rocks form and remain stable across a wide range of pressure-temperature (P-T) conditions within the eclogite facies domain, including ultrahigh-pressure (UHP) conditions where coesite may be present (Terry et al., 2000). Kyanite-eclogites typically originate from aluminum-rich basic rocks, such as Al-rich basalts, gabbros, or pyroxene granulites (Green, 1967).
Unique Identifiers
Mindat ID:
472101
Long-form identifier:
mindat:1:1:472101:3
Classification of Kyanite-eclogite
Mineralogy of Kyanite-eclogite
Essential minerals - these are minerals that are required within the classification of this rock:
| Garnet Group | X3Z2(SiO4)3 |
| Kyanite | Al2(SiO4)O |
| Pyroxene > Clinopyroxene > Omphacite | (NaaCabFe2+cMgd)(AleFe3+fFe2+gMgh)Si2O6 |
Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
| Amphibole | A petrological term for Amphibole Supergroup. |
| Phengite | KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2 |
| Rutile | TiO2 |
| Zoisite | (CaCa)(AlAlAl)O[Si2O7][SiO4](OH) |
Chemical Analysis
Oxide wt%:
| 1 | |
|---|---|
| SiO2 | 52.04 % |
| TiO2 | 0.56 % |
| Al2O3 | 15.95 % |
| Fe2O3 | 8.18 % |
| MnO | 0.14 % |
| MgO | 8.96 % |
| CaO | 9.03 % |
| Na2O | 1.80 % |
| K2O | 1.18 % |
| P2O5 | 0.13 % |
| LOI | 0.95 % |
| Total: | 98.92 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | n/a |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Charakoma eclogite, Soufli, Evros, Eastern Macedonia and Thrace, Greece | Bulk rock chemistry of a kyanite-eclogite sample. Average of 6 analyses. |
Internet Links for Kyanite-eclogite
mindat.org URL:
https://www.mindat.org/min-472101.html
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References for Kyanite-eclogite
Reference List:
Green, Trevor H. (1967) An experimental investigation of sub-solidus assemblages formed at high pressure in high-alumina basalt, kyanite eclogite and grosspydite compositions. Contributions to Mineralogy and Petrology, 16 (1) 84-114 doi:10.1007/bf00371609
Terry, Michael P., Robinson, Peter, Ravna, Erling J. Krogh (2000) Kyanite eclogite thermobarometry and evidence for thrusting of UHP over HP metamorphic rocks, NordÃļyane, Western Gneiss Region, Norway. American Mineralogist, 85 (11) 1637-1650 doi:10.2138/am-2000-11-1207
Ãetinkaplan, Mete, Pourteau, Amaury, Candan, Osman, Koralay, O. Ersin, OberhÃĪnsli, Roland, Okay, Aral I., Chen, Fukun, Kozlu, HÞseyin, ÅengÞn, FÄąrat (2016) PâTât evolution of eclogite/blueschist facies metamorphism in Alanya Massif: time and space relations with HP event in Bitlis Massif, Turkey. International Journal of Earth Sciences, 105 (1) 247-281 doi:10.1007/s00531-014-1092-8
Localities for Kyanite-eclogite
Showing 11 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
â - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Austria | |
| Miller et al. (2005) |
| Miller et al. (2005) |
| Miller et al. (2005) |
| Hoschek (2001) +1 other reference |
| Hoschek (2004) |
Bulgaria | |
| JanÃĄk et al. (2011) |
Greece | |
| Mposkos et al. (2011) |
Greenland | |
| Cao (2016) |
Norway | |
| Terry et al. (2000) |
Russia | |
| Mikhailenko et al. (2019) |
Turkey | |
| Okay et al. (1985) |
Lake Ellen Kimberlite prospect, Lake Ellen, Mansfield Township, Iron County, Michigan, USA